#include<stdlib.h>
#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<time.h>

int main(int argc,char **argv){

   time_t tn = time(NULL);
   struct tm *tmp;
    char dd[24];

   tmp = localtime(&tn);
   size_t stime = strftime(dd,24,"%F_%T",tmp);
   printf(" %s \n",dd);
   



   return 0;
}